In this case, the function \(g_{\eta 0}^{2}\rightarrow 0\)  and the corresponding differential cross-sections (REF ) and (REF ) have sharp peaks. Note that the nature of these peaks is due to the small transmitted momenta in the ultrarelativistic limit of electron energies (see [1]}). The resonant cross-sections can be integrated near these peaks (REF ) by the saddle points method. So, for channel A, the differential cross-section (REF ) can be represented as:
\(\frac{d{{\sigma }_{\eta i\left( l,r \right)}}}{d{x^{\prime }_{\eta i\left( r \right)}}d{{\delta }^{\prime }}^{2}_{\eta i}}=\frac{{{\left( 2\pi \right)}^{2}}{{Z}^{2}}\alpha r_{e}^{2}\left( 1-{x^{\prime }_{\eta i\left( r \right)}} \right)K\left( {{u}_{\eta i\left( r \right)}},{{\varepsilon }_{\eta \left( r \right)}} \right)}{\left[ {{\left( 1+{{\eta }^{2}} \right)}^{2}}{{\left( {{\delta }^{\prime }}^{2}_{\eta i}-{{\delta }^{\prime }}^{2}_{\eta i\left( r \right)} \right)}^{2}}+\Upsilon _{\eta i\left( r \right)}^{2} \right]{x^{\prime }_{\eta i\left( r \right)}}}{{C}_{\eta i\left( l,r \right)}},\) 
